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-rw-r--r--libcrystfel/src/crystal.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/libcrystfel/src/crystal.h b/libcrystfel/src/crystal.h
index 7552a257..b4726cce 100644
--- a/libcrystfel/src/crystal.h
+++ b/libcrystfel/src/crystal.h
@@ -52,10 +52,11 @@ extern "C" {
#endif
extern Crystal *crystal_new(void);
-extern Crystal *crystal_copy(Crystal *cryst);
+extern Crystal *crystal_copy(const Crystal *cryst);
extern void crystal_free(Crystal *cryst);
extern UnitCell *crystal_get_cell(Crystal *cryst);
+extern const UnitCell *crystal_get_cell_const(const Crystal *cryst);
extern double crystal_get_profile_radius(Crystal *cryst);
extern RefList *crystal_get_reflections(Crystal *cryst);
extern double crystal_get_resolution_limit(Crystal *cryst);